372 



W. HAROLD LEIGH-SHARPE 



These figures should further be compared with the diagrams of 

 corresponding transverse sections of Rhina given in figure 12. 



Some objection may be taken to the term ^prostatic' to include 



all these glands as in figure 9, C II. The human prostate is 



A. vd. 



m. 



Fig. 9 For explanation see text p. 371. r., rectum; u., ureter; v.d., vas 

 deferens; r.g., rectal gland; c, claspers; ti.p.g., upper prostatic glands; l.p.g., 

 lower prostatic glands. 



endodermal in origin and arises as evaginations of the urino- 

 genital sinus. Cowper's and Bartolini's glands are ectodermal 

 (epidermal) in origin and arise as invaginations of the procto- 

 daeum. The clasper glands are also developed as invaginations 

 of the epidermis. It is obvious, therefore, that the clasper 



